Mid2009 MacBook Pro Battery replacement
Wife's battery was showing a message that it needed to be replaced and her computer was running dirt slow.
The repair was a cake walk following the repair guide on the site. I also was able to clean out a bunch of dust bunnies :).
This is a pretty easy install, but just pay attention to the VERY tiny screws. 3 are long and the rest are so tiny that if you dropped them on a rug you would be on your hands and knees for a while hunting.
Phillips #00 Screwdriver
P6 Pentalobe Screwdriver 2009 15" MacBook Pro Battery
MacBook Pro 15" Unibody (Mid 2009/Mid 2010) Replacement Battery